Editing Iron(II) oxide (section)

{{short description|Inorganic compound with the formula FeO}}
{{Chembox
| Watchedfields  = changed
| verifiedrevid  = 477163416
| ImageFile1     = Iron(II) oxide.jpg
| ImageSize1     = 
| ImageName1     = Iron(II) oxide
| ImageFile2     = Manganese(II)-oxide-xtal-3D-SF.png
| ImageSize2     = 
| IUPACName      = Iron(II) oxide
| SystematicName = 
| OtherNames     = Ferrous oxide, Iron monoxide, Wüstite
| Section1       = {{Chembox Identifiers
| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}
| ChemSpiderID = 14237
| UNII_Ref = {{fdacite|correct|FDA}}
| UNII = G7036X8B5H
| InChI = 1/Fe.O/rFeO/c1-2
| InChIKey = UQSXHKLRYXJYBZ-WPTVXXAFAB
| ChEBI_Ref = {{ebicite|correct|EBI}}
| ChEBI = 50820
| SMILES = [Fe]=O
| StdInChI_Ref = {{stdinchicite|correct|chemspider}}
| StdInChI = 1S/Fe.O
| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}
| StdInChIKey = UQSXHKLRYXJYBZ-UHFFFAOYSA-N
| CASNo = 1345-25-1
| CASNo_Ref = {{cascite|correct|CAS}}
| EINECS = 
| PubChem = 14945
| RTECS = 
| Gmelin = 13590
 }}
| Section2       = {{Chembox Properties
| Formula = FeO
| MolarMass = 71.844 g/mol
| Appearance = black crystals
| Density = 5.745 g/cm<sup>3</sup>
| MeltingPtC = 1377
| MeltingPt_ref = <ref>Pradyot Patnaik. ''Handbook of Inorganic Chemicals''. McGraw-Hill, 2002, {{ISBN|0-07-049439-8}}</ref>
| BoilingPtC = 3414
| BoilingPt_notes = 
| Solubility = Insoluble
| SolubleOther = insoluble in [[alkali]], [[ethanol|alcohol]] <br> dissolves in [[acid]]
| Solvent = 
| pKa = 
| pKb = 
| RefractIndex = 2.23
| MagSus = {{val|+7200|e=-6|u=cm3/mol}}
 }}
| Section3       = {{Chembox Structure
| CrystalStruct = 
| Coordination = 
 }}
| Section4       = {{Chembox Thermochemistry
| DeltaHf = 
| DeltaHc = 
| Entropy = 
| HeatCapacity = 
 }}
| Section7       = {{Chembox Hazards
| ExternalSDS = [http://www.inchem.org/documents/icsc/icsc/eics0793.htm ICSC 0793]
| MainHazards = can be combustible under specific conditions<ref>{{Cite web|url=https://art.illinois.edu/images/documents/MSDS/Metals/Ferric-Oxide.pdf|title=Ferric(ous) Oxide, Black |website=art.illinois.edu |archive-url=https://web.archive.org/web/20190511223604/https://art.illinois.edu/images/documents/MSDS/Metals/Ferric-Oxide.pdf |archive-date=11 May 2019 |url-status=dead}}</ref>
| NFPA-H = 1
| NFPA-F = 1
| NFPA-R = 0
| FlashPt = 
| AutoignitionPtC = 200
| ExploLimits = 
| PEL = 
 }}
| Section8       = {{Chembox Related
| OtherAnions = [[Iron(II) sulfide]]<br>[[Iron(II) selenide]]<br>[[Iron(II) telluride]]
| OtherCations = [[Manganese(II) oxide]]<br>[[Cobalt(II) oxide]]
| OtherFunction  = [[Iron(II,III) oxide]]<br>[[Iron(III) oxide]]
| OtherFunction_label = [[Iron]] [[oxide]]s
| OtherCompounds = [[Iron(II) fluoride]]
 }}
}}

'''Iron(II) oxide''' or '''ferrous oxide''' is the [[inorganic compound]] with the formula FeO.  Its mineral form is known as [[wüstite]].<ref name=Mindat>{{Cite web|url=https://www.mindat.org/min-4316.html|title=Wüstite|website=www.mindat.org}}</ref><ref name=IMA>{{Cite web|url=https://www.ima-mineralogy.org/Minlist.htm|title=List of Minerals|date=March 21, 2011|website=www.ima-mineralogy.org}}</ref> One of several [[iron oxide]]s, it is a black-colored powder that is sometimes confused with [[rust]], the latter of which consists of hydrated [[iron(III) oxide]] (ferric oxide). Iron(II) oxide also refers to a family of related [[non-stoichiometric compound]]s, which are typically iron deficient with compositions ranging from Fe<sub>0.84</sub>O to Fe<sub>0.95</sub>O.<ref name = "Greenwood">{{Greenwood&Earnshaw}}</ref>